а)(t-3)²=
б)(2t+1)²=
в)(3m²+t³)²=
г)(7с+3)*(7с-3)=
д)(4а+...)²=...+...+9b²
а,б,в,г-просто решить,а под буквой "д" за место "..." поставить подходящие числа.
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